Need Help ASAP.

[madamo]

Yesterday,
My Kenya Tree began to melt away. At first I figured that it might have touched another one of my corals when I was cleaning the tank. Now, my favia brain coral (the outer walls) has begun to turn white (don't know if it is bleached or it is the skeleton). My newest addition to the tank is the coral in the link below:

http://www.liveaquaria.com/product/prod_display.cfm?c=597+600+673&pcatid=673

The article claims that it can release toxins that can harm other coral. Has anyone experienced such an issue. I just did a 20% water change and I am taking water right now to get tested at the LFS. The tank is a 12 gallon aquapod with 70 watt MH lighting.

What could I do to prevent further loss. The tank is over a year old.

Has anyone experienced this issue

 

[madamo]

I have always run carbon. In fact, I just changed the carbon today. All of my water parameters were 0 (besides Nitrates which were 5 ppm). Two things that could have been the issue:

1. Bacterial Infection with the Kenya Tree (The base did turn dark brown/black)
2. I left the lights on Sunday for 6 additional hours.